Problem with Activation Code

Hello , I have cubase 10
any time I activate the last code I got from Steinberg, it said your code is already used trying to get new activation code from Steinberg but no success it have been many months now I cannot used my cubase fully, if any one help me this problem

You don’t need one if you have a USB elicenser, just plug it in.

If you use a soft elicenser log into your MySteinberg Account and reactivate it.